40 CFR § 373.4 - Definitions.
For the purposes of implementing this regulation, the following definitions apply:
(a) Hazardous substances means that group of substances defined as hazardous under CERCLA 101(14), and that appear at 40 CFR 302.4.
(b) Storage means the holding of hazardous substances for a temporary period, at the end of which the hazardous substance is either used, neutralized, disposed of, or stored elsewhere.
(c) Release is defined as specified by CERCLA 101(22).
(d) Disposal means the discharge, deposit, injection, dumping, spilling, leaking or placing of any hazardous substance into or on any land or water so that such hazardous substance or any constituent thereof may enter the environment or be emitted into the air or discharged into any waters, including groundwater.